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<h1>Neusis Mode</h1>

<p>Neusis Mode is a setting that allows the <a href="../basicediting/ruler.html">Ruler</a> to be moved freely and be fixed at any position and angle with one click. It can be used for neusis constructions such as angle trisection. Of course, it can also be used as a less accurate replacement for the <a href="anglebisector.html">Angle bisector</a> tool.
<p>Neusis Mode can be switched on/off by clicking <b>Edit &gt; Neusis Mode</b>. Entering Neusis Mode automatically enables <a href="previewmode.html">Preview Mode</a> because you need that for real neusis constructions.

<center><img src="neusismode/01.png" width="60%"></center>
<center><i>The trisection of an angle using Neusis Mode. You can find out more about this topic at <a href="https://plus.maths.org/content/trisecting-angle-origami">plus.maths.org</a>.</i></center>

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